定时器中断实验

南辰 · 发表于 2020-12-16 15:48:41

[/free][hide=3,money]用的是正点原子mini开发板stm32f103RCT6
************main函数**************
#include "led.h"
#include "usart.h"
#include "exti.h"
#include "key.h"
#include "delay.h"
#include "sys.h"

int main(void)
{
delay_init();
LED_Init();
KEY_Init();
My_EXTIX_Init();
USART1_Init(9600);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é ·Ö2×é
My_TIM3_Init(4999,7199);//Tout=((4999+1)*(7199+1))/72M=500ms

while(1)
{
      LED0=!LED0;
      delay_ms(100);//ÏÖÏó£ºLED0ÉÁË¸½Ï¿ì¼ä¸ô100ms£¬LED1ÉÁË¸½ÏÂý¼ä¸ô500ms
}
}

********time.c************
#include "time.h"
#include "led.h"

void My_TIM3_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//ÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_Prescaler=psc;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);//ÔÊÐí¸üÐÂÖÐ¶Ï

NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//ÇÀÕ¼ÓÅÏÈ¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;//×ÓÓÅÏÈ¼¶
NVIC_Init(&NVIC_InitStructure);

TIM_Cmd(TIM3,ENABLE);//Ê¹ÄÜ¶¨Ê±Æ÷3
}

void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update!=RESET))
{
      TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
      LED1=!LED1;
}
}

*********time.h***********
#ifndef _time_H
#define _time_H

#include "sys.h"

void My_TIM3_Init(u16 arr,u16 psc);
void TIM3_IRQHandler(void);

#endif

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